-- Pivot Forecast schema install
-- Run once against target database: psql -d <db> -f setup_sql/01_schema.sql

CREATE SCHEMA IF NOT EXISTS pf;

CREATE TABLE IF NOT EXISTS pf.source (
    id             serial PRIMARY KEY,
    schema         text NOT NULL,
    tname          text NOT NULL,
    label          text,
    status         text NOT NULL DEFAULT 'active',  -- active | archived
    default_layout jsonb,                            -- Perspective view config used as the per-source default
    created_at     timestamptz NOT NULL DEFAULT now(),
    created_by     text,
    UNIQUE (schema, tname)
);

-- backfill columns for existing installs
ALTER TABLE pf.source ADD COLUMN IF NOT EXISTS default_layout jsonb;

-- pf.dim_period: run setup_sql/gen_dim_period.sql to create and populate

CREATE TABLE IF NOT EXISTS pf.col_meta (
    id          serial PRIMARY KEY,
    source_id   integer NOT NULL REFERENCES pf.source(id) ON DELETE CASCADE,
    cname       text NOT NULL,
    label       text,
    role        text NOT NULL DEFAULT 'ignore',   -- dimension | value | units | date | ignore
    is_key      boolean NOT NULL DEFAULT false,   -- true = usable in WHERE slice
    dim_group   text,                             -- groups functionally dependent columns
    dim_period_col text,                          -- pf.dim_period column this dimension derives from
    in_grain    boolean NOT NULL DEFAULT false,   -- true = column defines the display grain
    opos        integer,
    UNIQUE (source_id, cname)
);

-- backfill columns for existing installs (must follow the CREATE above)
ALTER TABLE pf.col_meta ADD COLUMN IF NOT EXISTS dim_group text;
ALTER TABLE pf.col_meta ADD COLUMN IF NOT EXISTS dim_period_col text;
ALTER TABLE pf.col_meta ADD COLUMN IF NOT EXISTS in_grain boolean NOT NULL DEFAULT false;

CREATE TABLE IF NOT EXISTS pf.version (
    id              serial PRIMARY KEY,
    source_id       integer NOT NULL REFERENCES pf.source(id) ON DELETE RESTRICT,
    name            text NOT NULL,
    description     text,
    status          text NOT NULL DEFAULT 'open',               -- open | closed
    exclude_iters   jsonb NOT NULL DEFAULT '["reference"]'::jsonb,
    created_at      timestamptz NOT NULL DEFAULT now(),
    created_by      text,
    closed_at       timestamptz,
    closed_by       text,
    UNIQUE (source_id, name)
);

CREATE TABLE IF NOT EXISTS pf.log (
    id          bigserial PRIMARY KEY,
    version_id  integer NOT NULL REFERENCES pf.version(id) ON DELETE CASCADE,
    pf_user     text NOT NULL,
    stamp       timestamptz NOT NULL DEFAULT now(),
    operation   text NOT NULL,   -- baseline | reference | scale | recode | clone
    slice       jsonb,
    params      jsonb,
    note        text,
    tag         text            -- initiative label, e.g. 'reduce_spend'; groups
                                -- adjustments into a bridge from baseline to current
);

-- adding tags to an install that predates them
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS tag text;
CREATE INDEX IF NOT EXISTS log_tag_idx ON pf.log (tag) WHERE tag IS NOT NULL;

-- seed tags for loads that predate the column: a baseline/reference note is the
-- segment's name ('Open Orders', 'Prior Year'), which is exactly what tag holds.
-- Adjustment notes are free text, not labels, so they are left alone.
UPDATE pf.log
SET tag = note
WHERE TRUE
    AND tag IS NULL
    AND note IS NOT NULL
    AND note <> ''
    AND operation IN ('baseline', 'reference');

-- Display order for the pivot's segment and bucket columns.
--
-- The segment's display name in the pivot, falling back to tag then note.
--
-- Separate from both because those have jobs already -- tag groups adjustments
-- into initiatives for the bridge, note is free commentary -- and because the
-- label carries the sort order. Perspective orders column groups by the value
-- string, so a leading "01 - " is how ordering is expressed; putting that in the
-- note would put it in every note.
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS label text;

-- Vestigial, both of them. They held the ordinal when the "01 - " prefix was
-- computed for the pivot rather than typed into label and bucket: bucket_order
-- sequenced the bucket columns, log.seq the segments within them. Nothing reads
-- either now, and nothing writes them -- kept only because dropping a column is
-- not worth a migration to reclaim two that cost nothing.
ALTER TABLE pf.version ADD COLUMN IF NOT EXISTS bucket_order jsonb;
ALTER TABLE pf.log     ADD COLUMN IF NOT EXISTS seq integer;

-- What a segment contributes to, independent of pf_iter.
--
-- pf_iter answers "can operations write to these rows"; bucket answers "does this
-- belong in the forecast number". Those are not the same question -- Open Orders is
-- loaded as reference so nothing adjusts it, yet it is part of the forecast -- so
-- neither can be derived from the other.
--
-- Free text with suggested values (Forecast / Prior Year / Prior Prior Year / Plan)
-- rather than an enum, so a new banner does not need a migration. Blank by default:
-- until a segment is labelled, the pivot falls back to showing its own name.
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS bucket text;
CREATE INDEX IF NOT EXISTS log_bucket_idx ON pf.log (bucket) WHERE bucket IS NOT NULL;

-- The names a row falls back to when nobody has named it, per scenario. Null
-- means "use the built-in", which is the DISPLAY DEFAULTS block in
-- lib/sql_generator.js. Read through a join at query time, not baked into
-- pf.sql: those templates are keyed on (source_id, operation) and shared by
-- every version of a source.
ALTER TABLE pf.version ADD COLUMN IF NOT EXISTS adjustment_segment text;
ALTER TABLE pf.version ADD COLUMN IF NOT EXISTS adjustment_bucket  text;
ALTER TABLE pf.version ADD COLUMN IF NOT EXISTS unlabeled_load     text;

-- What the entry did, stamped when it did it.
--
-- Not a cache: a log entry's forecast rows never change after it is written.
-- Only the operation that owns the logid inserts them, and the only thing that
-- removes them is undo, which deletes this row too -- so these totals are fixed
-- at write time rather than derived from something that can move underneath
-- them. The change log was joining the whole forecast table to recompute them
-- on every open, 2.5M rows to total a few thousand.
--
-- measure_cols records which columns they are denominated in, since the value
-- and units roles can be reassigned in col_meta and the numbers would otherwise
-- quietly come to mean something else.
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS row_count    integer;
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS value_total  double precision;
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS units_total  double precision;
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS measure_cols jsonb;

-- The column an account's territory is expressed in -- the rep, the region,
-- whatever this source divides ownership by. Exactly one per source.
--
-- Flagged here rather than named in code because it is source-specific, the
-- same way the grain is: a second source should not need a code change to be
-- scoped by something other than a sales rep.
--
-- It does two jobs. The server scopes every read and write to the values on the
-- account, and recode refuses to *set* this column unless the account is an
-- admin -- moving a row between territories is reassignment, not forecasting.
ALTER TABLE pf.col_meta ADD COLUMN IF NOT EXISTS is_territory boolean NOT NULL DEFAULT false;

-- The debug path: what the entry was trying to do, and what that became.
--
-- Both, deliberately. params records the intent -- the slice, the scope, the
-- resolved increments -- and sql_text records the statement as executed, with
-- territory and scope already resolved into it. Keeping only one of them
-- assumes the translation between them is correct, which is exactly the
-- assumption in doubt when the rows look wrong.
--
-- env captures the state the intent was executed against that cannot be
-- reconstructed afterwards: the territory in force, the version's
-- exclude_iters, and when the template was generated. All three are mutable
-- rows elsewhere, and nothing remembers what they were.
--
-- The template generation is a fingerprint, not a version: it cannot reproduce
-- the old template, but it can tell you the entry ran under a different one,
-- which is what would otherwise make a replay quietly wrong.
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS env      jsonb;
ALTER TABLE pf.log ADD COLUMN IF NOT EXISTS sql_text text;

-- Master data for a dim_group: one row per key value, with its sibling columns.
--
-- The source is transactional and often a view over all history, so deriving a
-- member list from it is both slow and wrong -- slow because it means scanning
-- millions of rows, wrong because it can only describe what was transacted and
-- has no way to say a part is discontinued or that a new one exists before it
-- has sold. This table is the app's own list, refreshed from the source but
-- curatable independently of it.
CREATE TABLE IF NOT EXISTS pf.dim_member (
    source_id    integer NOT NULL REFERENCES pf.source(id) ON DELETE CASCADE,
    dim_group    text    NOT NULL,   -- matches pf.col_meta.dim_group
    key_value    text    NOT NULL,   -- the is_key column's value
    attrs        jsonb   NOT NULL DEFAULT '{}'::jsonb,  -- the sibling columns
    is_active    boolean NOT NULL DEFAULT true,
    source_seen  boolean NOT NULL DEFAULT true,  -- present in the source at last refresh
    added_at     timestamptz NOT NULL DEFAULT now(),
    updated_at   timestamptz NOT NULL DEFAULT now(),
    refreshed_at timestamptz,
    PRIMARY KEY (source_id, dim_group, key_value)
);

CREATE INDEX IF NOT EXISTS dim_member_active_idx
    ON pf.dim_member (source_id, dim_group) WHERE is_active;

-- generated operation SQL per source, stored after col_meta is configured
CREATE TABLE IF NOT EXISTS pf.sql (
    id           serial PRIMARY KEY,
    source_id    integer NOT NULL REFERENCES pf.source(id) ON DELETE CASCADE,
    operation    text NOT NULL,  -- get_data | baseline | reference | scale | recode | clone | undo
    sql          text NOT NULL,
    generated_at timestamptz NOT NULL DEFAULT now(),
    UNIQUE (source_id, operation)
);

-- pf.layout: named Perspective view configs.
--
-- Replaces the per-browser localStorage lists (pf_layouts_v*) and the single
-- anonymous pf.source.default_layout. A layout is either `private` -- visible
-- only to its owner -- or `published`, visible to everyone on the version and
-- writable only by its owner or an admin, the same rule pf.log already uses.
CREATE TABLE IF NOT EXISTS pf.layout (
    id          serial PRIMARY KEY,
    source_id   integer NOT NULL REFERENCES pf.source(id)  ON DELETE CASCADE,
    -- null = applies to every version of the source; that is where the old
    -- source default lives, and what a new version picks up before anyone has
    -- published a layout of its own.
    version_id  integer          REFERENCES pf.version(id) ON DELETE CASCADE,
    name        text    NOT NULL,
    config      jsonb   NOT NULL,
    owner       text    NOT NULL,
    visibility  text    NOT NULL DEFAULT 'private',   -- private | published
    is_default  boolean NOT NULL DEFAULT false,       -- applied on first load
    created_at  timestamptz NOT NULL DEFAULT now(),
    updated_at  timestamptz NOT NULL DEFAULT now(),
    CHECK (visibility IN ('private', 'published')),
    -- only a published layout can be the default: a private one would be a
    -- default nobody else could see.
    CHECK (NOT is_default OR visibility = 'published')
);

-- COALESCE rather than the bare column: version_id is nullable, and in a unique
-- index NULLs are distinct, so source-wide rows would not be constrained at all.
CREATE UNIQUE INDEX IF NOT EXISTS layout_private_name
    ON pf.layout (source_id, COALESCE(version_id, 0), owner, lower(name))
    WHERE visibility = 'private';

CREATE UNIQUE INDEX IF NOT EXISTS layout_published_name
    ON pf.layout (source_id, COALESCE(version_id, 0), lower(name))
    WHERE visibility = 'published';

-- one default per scope
CREATE UNIQUE INDEX IF NOT EXISTS layout_one_default
    ON pf.layout (source_id, COALESCE(version_id, 0))
    WHERE is_default;

CREATE INDEX IF NOT EXISTS layout_lookup ON pf.layout (source_id, version_id);

-- Carry the old single source default across as a published, source-wide row.
-- Idempotent: skipped once a default exists for that source.
INSERT INTO pf.layout (source_id, version_id, name, config, owner, visibility, is_default)
SELECT s.id, NULL, 'Source default', s.default_layout, COALESCE(s.created_by, 'admin'), 'published', true
FROM pf.source s
WHERE TRUE
  AND s.default_layout IS NOT NULL
  AND NOT EXISTS (
      SELECT 1 FROM pf.layout l
      WHERE TRUE
        AND l.source_id = s.id
        AND l.version_id IS NULL
        AND l.is_default
  );